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Approximate Conversion from Points to Pixels
(and Ems and %)
Here's a chart that converts points to pixels (and ems and %). 
It's an approximation, which will depend on font, browser and OS, 
but it's a good starting point.

Points     Pixels    Ems      Percent
---------------------------------------
 6          8         0.5         50
 7          9         0.55       55
 7.5      10          0.625      62.5
 8         11         0.7         70
 9         12         0.75       75
10        13          0.8         80
10.5      14         0.875      87.5
11        15          0.95       95
12        16          1          100
13        17          1.05      105
13.5     18          1.125    112.5
14        19         1.2        120
14.5     20         1.25       125
15        21         1.3        130
16        22         1.4        140
17        23         1.45      145
18        24         1.5        150
20        26         1.6        160
22        29         1.8        180
24        32         2           200
26        35         2.2        220
27        36         2.25      225
28        37         2.3        230
29        38         2.35      235
30        40         2.45      245
32        42         2.55      255
34        45         2.75      275
36        48         3          300

// because the bitmap is expanded, i must look for the new size

FUNCTION ONPAINT(hDC,oBmp,nVColor,nBColor,nTColor,cText)

......
......

nTXTLG := GetTextWidth( hDC, cText )     // New
nBMPLONG  := oBmp:Super:nWidth() 
nBMPHIGHT := oBmp:Super:nHeight() 
nFONTHIGHT := oBFont:nInpHeight * -1 
nLEFT := (nBMPLONG - nTXTLG) / 2          // it centers the text

// still i have to calculate the top of the text
// There is no function GetTextHight( hDC, cText )
// A dialog-title will have allways a small bitmap-hight
// I can do this ( not a clean way ) :
// The Height 12, 14, 16 and so on are not pixel
// so i have to adjust the Font-Hight with the table from above.

nNEWHEIGHT := 10

IF nFONTHEIGHT = 10 
    nNEWHEIGHT := 13
ENDIF
IF nFONTHEIGHT = 12 
    nNEWHEIGHT := 16
ENDIF
....
.....

// Top of Text inside of a Bitmap
// ----------------------------------- 
nTOP := ( nBMPHEIGHT - nNEWHEIGHT ) / 2

.....
.....
.....